Type exactly the following in a Linux Terminal (+New → Terminal) to see all processes running in a project:

htop

The header informs you about overall utilization of the node,
each row (you can scroll via your cursor keys) lists a process and use your F5 key
to toggle between a tree or a sorted list.
The column RES tells you the residual memory usage (what’s really being used, more or less),
and the CPU% column the computational use of one CPU core.
The TIME+ column tells you the aboslute time that process has used the CPU.

Select one or more processes via the space key of your keyboard.
Via the F9 key you can terminate or kill a process, etc.

If supported, mouse-clicks should also work.

See htop manpage for more information
or click the letter h for help after starting it up; and q to quit the application.

It lists all processes and the bottom line shows the total sum.
The last RSS column is probably the most interesting one, for more consult mansmem. The total used memory is also listed under “Project usage and quotas” in Project Settings (based on Linux’ cgroup management).

Besides htop and smem, there are many more system utilities installed.
Given a project runs in a Docker environment, you only see a limited view of all what’s going on, but it might still be interesting for you.